<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .one-1 {
        font-size: 12px;
      }
      .one-2 {
        transform: scale(0.7);
      }
    </style>
  </head>
  <body>
    <div>默认字体</div>
    <div class="one">
      <div class="one-1">我是12px的字体</div>
      <div class="one-2">我是小于12px的字体</div>
    </div>
  </body>
</html>
